I got this in a mixed lot with some 'good' pieces at auction, and would like to know more about it if possible.

It's solid glass and is about 9.5cm tall by 6cm base diameter. The glass appears to be almost clear with a slight greeny tinge to it but, as you move it, all sorts of greens, blues and purples appear ~ it's magic!!! Has a polished base with a slight indentation.